
package com.bei_en.teacher.management.shiro;

import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import net.sf.ehcache.Ehcache;
import org.apache.shiro.cache.Cache;
import org.apache.shiro.cache.CacheException;
import org.apache.shiro.cache.CacheManager;
import org.apache.shiro.util.CollectionUtils;
import org.springframework.cache.support.SimpleValueWrapper;

/**
 * 封装Spring cache
 * <p>Version: 3.0
 */
public class SpringCacheManagerWrapper implements CacheManager {

    private org.springframework.cache.CacheManager cacheManager;

    /**
     * 设置spring cacheManager
     *
     * @param cacheManager
     */
    public void setCacheManager(org.springframework.cache.CacheManager cacheManager) {

	this.cacheManager = cacheManager;
    }

    @SuppressWarnings("unchecked")
    public <K, V> Cache<K, V> getCache(String name) throws CacheException {

	org.springframework.cache.Cache springCache = cacheManager.getCache(name);
	return new SpringCacheWrapper(springCache);
    }

    @SuppressWarnings("rawtypes")
    static class SpringCacheWrapper implements Cache {

	private org.springframework.cache.Cache springCache;

	SpringCacheWrapper(org.springframework.cache.Cache springCache) {

	    this.springCache = springCache;
	}

	public Object get(Object key) throws CacheException {

	    Object value = springCache.get(key);
	    if (value instanceof SimpleValueWrapper) {
		return ((SimpleValueWrapper) value).get();
	    }
	    return value;
	}

	public Object put(Object key, Object value) throws CacheException {

	    springCache.put(key, value);
	    return value;
	}

	public Object remove(Object key) throws CacheException {

	    springCache.evict(key);
	    return null;
	}

	public void clear() throws CacheException {

	    springCache.clear();
	}

	public int size() {

	    if (springCache.getNativeCache() instanceof Ehcache) {
		Ehcache ehcache = (Ehcache) springCache.getNativeCache();
		return ehcache.getSize();
	    }
	    throw new UnsupportedOperationException(
		    "invoke spring cache abstract size method not supported");
	}

	@SuppressWarnings("unchecked")
	public Set keys() {

	    if (springCache.getNativeCache() instanceof Ehcache) {
		Ehcache ehcache = (Ehcache) springCache.getNativeCache();
		return new HashSet(ehcache.getKeys());
	    }
	    throw new UnsupportedOperationException(
		    "invoke spring cache abstract keys method not supported");
	}

	@SuppressWarnings("unchecked")
	public Collection values() {

	    if (springCache.getNativeCache() instanceof Ehcache) {
		Ehcache ehcache = (Ehcache) springCache.getNativeCache();
		List keys = ehcache.getKeys();
		if (!CollectionUtils.isEmpty(keys)) {
		    List values = new ArrayList(keys.size());
		    for (Object key : keys) {
			Object value = get(key);
			if (value!=null) {
			    values.add(value);
			}
		    }
		    return Collections.unmodifiableList(values);
		} else {
		    return Collections.emptyList();
		}
	    }
	    throw new UnsupportedOperationException(
		    "invoke spring cache abstract values method not supported");
	}
    }
}
